Improvement in pumps



UNITED STATESv PATENT OFFICE.'

IMPROVEMENT IN PUMPS.

Specification forming part of Letters Patent No. 38,689, dated May 26, 18.63'.

To @ZZ whom it may concern:

Be it known that I, THEoDoRE J. Mc-

GOWAN, of Cincinnati, in the county of HamY ilton and State ot Ohio, have invented a new and Improved Pump; and I ldo hereby declare that the following is a full, clear, and exact description of the same,'reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a vertical section of my invention, taken in the line .c m, Fig. 2. Fig. 2 is a horizontal section of the same, taken-in the line y y, Fig. l. Fig. 3 is a vertical section of the same, taken in the line z a, Fig. l.

Similar letters of .reference indicate corresponding parts in the several figures.

This invention consists in a novel arrangement of valves, water-passages, and air-chambers, as hereinafter fully set forth, wherebyT the pump can be worked or operated much more rapidly than usual, and without any slamming of the valves and reaction of the same on their seats, thereby rendering the pump more durable and much more efficient in its operation.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the pump-cylinder, and B the piston which works within it.

C is the piston-rod, which passes through a stuffing-box, D, at the top of the cylinder.

E represents a case which encompasses the pump-cylinder A and forms an air chamber, F, around the pump cylinder.

G is a side pipeor water-passage, which is within the air-chamber F, adjoining the pumpcylinder, and communicates with it at its upper end, as shown at c in Fig. 1.

H is a discharge-pipe, which is by the side of the pipe G, and extends up through the top of the case E. The lower end of the discharge-pipe H communicates at its lower end with the air-chamber F through an opening, b, at one side of it. (See Fig. 2.)

The pump-cylinder A and air-chamber F rest on a bed-plate, 1, underneath which there is a suctioupassa-ge, J, which extends underneath two valves, c c', opening upward. One of these valves is shown in Fig. 1, and both are shown in Fig. 3. The passage J communicates by means of two passages, K K', with the upper and lower end of the pump-cylinder, the passage K extendingl to the lower end of the cylinder A, and the passage K extending to the lower end of the side pipe, G,

as shown by the dotted line in Fig. 2. The passage J at one end extends up through the bed-plate I, as shown at a, Fig. 3, and communicates with a chamber, L, the use of which will be presently shown. Directly over the valves e c there is placed avalve-seat, M,

having two valves, d d. These valves open upward into a chamber, N, one end of which communicates by means of a passage, O, with the air-chamber F. (See Figs. 2 and 3.)

The operation is as follows: Suppose the piston B to be rising in the cylinder A. A suction will be produced in the passages K J, and water will flow through valve c and the passage K into the lower end of the cylinder K, as indicated by the solid red arrows. .The piston B in its descent closes valve c, the water passing out of the cylinder through passage K and up through the valve d into the chamber N and along said chamber to the passage O, and through said passage into the air-chamber F, and through the opening b into the discharge-pipe H, out of which it is discharged. (See dotted red arrows.) When the piston commenced its descent, the valve c opened, and the water flowed through J into K', and up through the side pipe, G, into the upper end of the cylinder A, (see solid black arrows 5) and when the piston commenced its upward movement the water passed down the side pipe, G, through K into N, and into the air'chamber F.

The use of the chamber L is this: In the operation of a-n ordinary pump the water,

being non-elastic, must yat the termination of each stroke of the piston be at rest until the piston commences the next stroke, when the entire column of water in the suction requires to be started; but by means of the chamber L the above difficulty is obviated.

Thus the chamber L is in communication' with the suction-passage J, as previously described, and when the pump is rst started the air in the chamber L will be rareiied by the action of the piston, and the water will rise into the chamber L and fill or partly fill it. Suppose, for instance, the piston to be startedl on the upstroke. A portion of the Water in L by gravity and suction Will descend into J and pass through valve c While the column in the suction is being put in motion at the completion of the stroke, the valves being all closed, the chamber L in the meantime being filled to compensate for what the piston withdrew at the commencement of the previous stroke, and keeps so continuously at the commencement of every stroke. By this arrangement the pump can be worked much faster than the common double-acting or piston pump, as the operation of the chamber L tends to make aconstantiow into the pump While in operation. It also prevents any jar in the suctionpipe, and allows the valves to fall quietly on their seats Without reaction. The air-chamber F also makes a constant discharge, and by said air-ohamber,in connection with chamber L, the momentum of the Water is not 10st, as in other piston-pumps.

l would remark that the chamber L may be applied to single as well as to doubleacting pumps.

`Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The chamber L, when arranged and combined with water-passages, valves, and an airchamber, F, of a double or single acting pump, to operate in the manner as and for the purposes herein set forth.

THEODORE J. MGGOWAN.

Witnesses:

JOHN HAYES MCGOWAN, FREDERICK GOULE. 

